div {
	margin: 10px;
	padding: 5px;
	font-size: 12px;
	line-height: 25px;
}
 
#father {
	background-color: aqua;
	border: 1px #666 solid;
	padding: 0;
	/* static：静态定位，没有定位，默认值，元素按照标准文档流进行显示 */
	position: static;
}
 
.box1 {
	background-color: #f2bb6f;
	border: 1px #B55A00 dashed;
	position: static;
}
 
.box2 {
	background-color: #003580;
	border: 1px #0000A8 dashed;
	position: static;
}
 
.box3 {
	background-color: #f3f3f3;
	border: 1px #395E4F dashed;
	position: static;
}